Motor



March 28, 1944. A, RAPPL 2,344,949

MOTOR Filed May ns1, 1940 2 sheeis-sheet 1 l INVENTOR Anggn Rappl,

ATT RNEYS @wa/M I vvmuu A. RAPPL March 2s, 1944.

MOTOR Filed May 3l, 1940 2 Sheets-Sheet 2 INVENTOIR Amon Rapp,

BY 2 ATT RKIEYs, u

Patented Mar. 2 8, 1944v Moron Anton Rappl, Buffalo, N. Y., assignor toTrico Products Corporation, Buiaio, Y.

Application May 31, 1940, Serial No. 337,966

14 Claims. (Cl. 121-97) The present invention relates to iiuid operatedmotors and has particular relation to motors of this type, such, forexample, as those employed for operating windshield cleaners onvehicles, having means for parking the drive shafts thereof in oneposition.

According to the present invention means are provided, in addition tothe valve means, which reverse the application of differential fluidpressures to opposite faces of the piston during normal operation, forblocking the normal channel of fluid flow to and from the motor chamberon one side of the piston and for placing the latter in directcommunication with a source of pressure, for parking the piston in apredetermined position. By this arrangement a manually operated controlvalve may be located remotely from the motor and may be connectedthereto by two conduits, one for conducting fluid for normal motoroperation and the other for the uid required for'parking the motor.

The means for blocking the normal channel of flow of fluid from themotor on one side of the piston and for providing direct communicationwith a source of pressure for parking, comprise a pair of valve elementsso connected that the first element is closed when the second is open,the first element serving to block the normal channel of uid iiow andthe second opening a direct path to the source of pressure for parking.

These and other objects and advantages will become apparent from thefollowing description of the typical embodiments of the invention thatare shown in the accompanying drawings, wherein: A

Fig. 1 is a front elevational view of a motor with the valve coverremoved, with certain parts broken away and appearing in verticalsection, and a remote manual control valve appearing in section;

Fig. 2 is a bottom plan view of the cover section of the motor casing;

Fig. 3 is a fragmentary1` vertical sectional view taken on line 3-3 ofFig. 1 at right angles to the structure appearing in section therein;

Fig. 4 is a fragmentary vertical sectional view, similar to the portionof Fig. 1 shown in vertical section, but of a modified construction;

Fig. 5 is a vertical section taken transversel of Fig. 4 on line 5-5therein;

Fig. 6 is a view taken along line 6-6 of Fig.

action valve operating means for the motor.

The motor casing may comprise a body section III and a cover section Il.separated by a gasket I2, and providing a motor chamber I3 in which avane type piston, I4, may reciprocate about the axis of a shaft I5 towhich it is secured, the shaft being journaled in bearings I6 of thecasing.

On. casing section II is a valve seat II into which open ports I8, I9and 2l, port I8 communieating with a nipple 22, port I3 opening throughpassage 23 into the motor chamber on the right side of the piston (asthe parts appear in Figs. 1 and 2), and port 2| kcommunicating with achannel 24 in the cover section.

The channel 24 opens through a valve seat 25 into a cylindrical chamber26 whose outer end is closed by a disc 21. A nipple 28 communicates,

through a passage 29, with the chamber 26, and

the latter is open, by way of a passage 3l, with a well 32 in the upperwall of the motor chamber on the left side of the piston.

A valve 33 disposed in channel 24 and adapted to close against seat 25,to block communication between the channel and chamber 26, has a stem 34connected to piston-valve 35. The latter comprises a cup leather 36having disc members 3l rigidifying the central or web portion thereofand having its flexible flange portions normally engaging thecylindricallwall of chamber 26.

Mounted for movement upon shaft l5 and against valve seat I'I is a valvemember 38 having a recess 39 which is adapted to connect ports I8 and I9in one position of the valve (as shown in Fig. 1) and to connect portsI3 and 2| in the reverse position of the valve. The valve opens to theatmosphere the one of ports I9 and 2l which is not in communication withport I8.

For operatingbthe valve 38 there may be employed the snap actionmechanism shown in Fig. 7, which is the subject matter of Patent No.1,978,634 grantedto Henry Hueber on October 30, 1934. This mechanism mayconsist of a kicker 4I which is pivoted to the shaft I5 at the axis ofthe latter and is engageable by one or the other of faces 42 of a recessin the end of the shaft. The kicker is engageable with ears 43 on valve38 to shift the latter between .its two operative positions. and itsouter end is engaged by a frame 44 which is anchored by a spring 45 toa'pressure plate 46. The latter is mounted over the shaft I5 upon a post41 extended from the adjacent face of the casing section I0, and bearsagainst the outer face of valve member 38.

When the shaft I5 moves angularly, counterclockwise as viewed in Fig.'7, right shoulder 42 will finally engage and move kicker 4I until theouter end thereof passes beyond a line extended through the center ofpost 41 and the center of shaft I5, whereupon spring 45 will snap thekickerv counterclockwise against the left shoulder 43 of valve 38 andmove the latter to its left limit position, connecting ports I8 and 2|.Movement of the shaft in the opposite direction, or clockwise, willcause the parts to operate in the reverse manner, snapping the valve tothe position shown in Figs. 1 and 7, wherein ports |8 and I9 areconnected.

The nipples 22 and 28 may be connected by conduits Il and 52, indicateddiagrammatically in Fig. l, to ports 53 and 54, respectively, in thecasing Il of a valve unit which may be, if desired, located remotelyfrom the motor. A manually operated slide valve 58 has a recess 51 whichin the position of the valve shown in Fig. l opens communicationbetweenport 53 and a port 58 that may be connected to a suitable sourceof less-thanfatmospheric pressure, such as the intake of an internalcombustion engine, the other port 54, r'beingblocked from the suctionsource port 58, although preferably being vented to the atmosphere. Inthe other position of the valve 53, the recess 51 may connect ports 54and 58, port 53 -being opened to the atmosphere.

With the parts in the position shown, air under atmospheric pressure mayenter the left side of the motor chamber, via port 2|, channel 24,

past valve 33 into chamber 25 beneath pistonvalve 35, passage 3| andwell 32, while air will be withdrawn from the right side of the motorchamber via channel 23, port I9, recess 39 in valve 3l, port |8 andnipple 22 to the source of low pressure. Accordingly, piston I4 willmove to the right until the snap action mechanism reverses the valve 38,causing the low pressure to be applied to the left side of the motorchamber and atmospheric pressure to the right side. Thus the valve meanswill alternate application of sub-atmospheric and atmospheric pressuresto opposite sides of the motor chamber, causing the piston toreciprocate.

When the control valve 58 is moved to connect ports 54 and 58, air willbe withdrawn from chamber 23 via passage 29, nipple 28 and conduit 52.Since the channel 24 will be open to the atmosphere, either through port53 or directly through port 2|, depending upon the position of valve 38,the'piston-valve 35 will be caused tc rise, closing'valve 33 upon seat25, and thereby closing communication between port 2| and the left sideof the motor chamber. Continued withdrawal will result in air beingdrawn from the left side of the motor chamber through passage 3| andpast the flexible flange portions ocup leather 3E, causing the piston I4to move to parked position wherein a closure 6| carried by its seatsover the well 32. During such parking movement of the piston,atmospheric air may enter the right side of the motor chamber from port53 if the valve 38 is in the position shown in Fig. 1. If the valve 381sin the opposite or reverse position, atmospheric air will enter directlythrough port I9. When the valve is moved to connect the ports 53 and 58,as shown in Fig. 1, the operation of the motor will be resumed since theparking port 54 will be open to the atmosphere and therefore theatmospheric pressure acting on the upper side of the piston-valve 35will move the latter to unseat the valve 33.

In the modified structure shown in Figs. 4, and 6, a disc valve 1|closing against a fiat valve seat 12 replaces the valve 33 and seat 25of the device shown in Figs. 1, 2 and 3 while a disc valve 13 closingagainst a seat 14 replaces the pistonvalve 35. Valves 1| andv 13 areseparated by a valve stem 15 of such length that one valve must be openwhen the other is closed, and the stem is guided by radial webs 15 inthe passage 11 between chamber 28 and channel 24.

The ends of the stem are preferably tapered and complementary taperedrecesses 18 are formed in the'valve discs for receiving the ends of thestem. Valve 1|, when in the fully opened position thereof shown in Figs.4 and 5, may rest upon the gasket l2, the mass of stem 15 maintainingthe valve substantially centered. A ridge is preferably formed in theclosure disc 19 for preventing valve 13 from :becoming excessivelytipped or uncentered when in open position.

Operation is substantially the same as of the device shown in Figs. 1, 2and 3, the valve 1| being open and valve 13 closed during normaloperation of the motor, so that valve port 2| is in communication viachannel 24, passages 11 and 3|, and well 32 with the left side of themotor chamber; whereas when air is withdrawn through nipple 28, theresulting pressure differential ,between the fluid in channel 24 andchamber 2l results in opening of valve 13 and closing of valve 1 I,whereby port 2| is blocked from the left side of the motor chamber andthe latter is placed in open communication with the source of parkingpressure through nipple 28. The piston will then move to its parkedposition wherein well 32 is closed. i

If desired the valve stem 15 may be attached to the .valve 1| and 13.However, in the illustrated construction this is not done because thevalves are suitably confined by adjacent walls of passage 24 and chamber23, and fluid pressures acting upon them sulce to operate them.

It will be understood that the structures herein shown and described aremerely illustrative of the inventive principles involved and that thesemay be otherwise embodied without departing from the spirit of theinvention or the scope of the appended claims.

I claim:

l. In a. fluid pressure motor having a motor chamber and piston meansmovable therein, a passage for applying operating Dressur@ to thechamber and a second passage for applying a parking pressure to thechamber, the two passages adapted to be associated with means forselectively rendering either passage operative, automatic valve meansfor alternately directing the operating pressure from the iirst passageto the chamber on the opposite sides of the piston means, a pressureoperated valve responsive to pressure in said second passage to placeone side of the chamber in communication with said second passage, and asecondv pressure operated valve closing upon opening of the said rstnamed pressure operated valve for blocking communication between saidone side of the chamber and the automatic valve means.

2. In a fluid pressure motor havinga motor chamber and piston meansmovable therein, a passage for applying operating pressure to thechamber and a second passage for applying a parking pressure to thechamber, the two passages adapted to be associated with means for`selectively rendering either passage operative, au-

opposite direction.

passage,` a second chamber communica;

`said passage between the valve and meter im ber, a second passageselectively operable with passage, and a second valve'closing uponopening of the pressure operated valvev ior blocking' communicationbetween said one sidevof the chamber and the automatic valve means, saidsecond valve being connected to the pressure operated valve foroperation thereby-in one direction but movable independently thereoiinthe 3. In a fluid pressure'motorhaving ainotor chamber and p iston meansmovabletherein, a;

- chamber and .a .second passage for.' applying a parking pressure tothechamber, the 'tw'o passages adapted. to be associated withmeansjforselectively rendering either passage operative, automatic valve meansfor-alternately directing the .operating pressure from the first passagetothe chamber on opposite sides-of the piston means,

and vmeans independentv of thel automatic valve means andl responsive to.the pressure in said sec.-`

ond passage for blocking'the application of pressure'to one slide of thechamberby the-automatic side oi' the valve means and-for connecting saidchamber' vto said second passage.4

4. In a. iluid pressure mptor havingajmotor chamber andpiston meansmovable therein,

' means for applying, alternately, differential operating pressures. tothe opposite sides of the.

chamber for 'reciprocating' the piston -means therein, apassageselectivelyoperable with thel applying means for applying pressureto oneside f of the chamber for ,moving the piston means to a parked position,Sand iiuid. pressure/operated.

means'responsive'to pressure in saidpassage for substantiallysimultaneously opening' said pas# sage vand blocking communicationbetween said Aone side of the' chamber and said means for applying thedifferential operating pressures'.

5. In a fluid pressure motor having a motor chamber and piston meansmovable; therein,

means `for applying pressurey to -one side .of `the. chamber for -movingthe piston means to a parked position, said passage having avalvefchamber ber, each valvechamber openingthrough a valve seat into acommon duct leading to said one side of the motor chamber, a v alve ineachvalve chamber connected to the companion valve '-ior plying'meansand-communicating lwith thev'rst i 3 tion o! the pressure of oi' themotor chamber.

7.- In a iluid pressure motor having a .motor chamberand piston meansmovable therein,

means for'alternatel'y applying dliierential pres'- sures tooppositesides of the chamber and in said source topsald side.

cluding a passage on one side of the piston means,

a normally open iluid `actuated valve for closing said passage,'a secondpassage selectively operable with the' applying means andcommunicatingwith the ilrst mentioned passage between said normally open valveand themotor chamber for applying a parking' pressure tothe 'motor` cham- 1 8.Ina fluid pressure motor having a l'motor chamber -andpiston means'movable therein,

means foralternately applying differential pressures to opposite sidesof the chamber andvin- Y c luding'a' passage on one side of thepistonineans,l l anormally open valve for closing saidpassage, a

secondpassage selectively opera-ble with the ap plying means andcommunicating with "the'iirst ing. pressurefto the motor chamber', anormally closed valve `for said second'passzstge,` and'meanslassociatingmaid, valves whereby the 1- normally 'closed'valve 'must beopen when thel other valve is closed, said last mentionedmeanscomprising a slidable stem disposed. between the valves.

9 In a fluid pressure motor having a motor cham'ber and .piston' meansmovable therein,

sures to .opposite sides of the chamber .and insecond passageselectively operable with the apmentioned passage between said normallyopen valveand the motor chamber for applying a parkl sociating saidvalves'whereby the' normally closed and said'applying means having avalve chami valve must `be open whenthe other valveis closed, said-:last lmentioned means comprising a stem disposed between the valves,and the' valves l having recesses for freely' receiving the ends of,'said stem.

substantially simultaneouslyopeningl said pas? sage and blockingcommunication :between said- -one side of thechamber and said meansv forap-v plying the differential operating pressures,` one of saidl valvesbeing operated in respcuisev to thejj pressure in said passage.

means for alternately applying'differential pres-l sures to oppositesides of the-chamber and including afpassage .on one side of the.pistonmeans, anormally vopen valve for closing said k,

the applying means and connecting saidsecond chamber to a source ofpressure for. parking the motor, yand a u'id operable member insaid'sec- .10. Ina fluid 'pressure motorhaving' a motor sures .toopposite sides of' the chamber and including 'a passage on onesideofithe piston means, a normally open valve for closing said passage, a

second passage selectively operable iwith the applying means andcommunicating with the iirst mentioned passage lbetween saidl normallyopen -valve and the motor chamber for applying a parking pressure to themotor chamber, 'a normally closedvalvel for said second passage, 'saidvalves having tapered recesses formed therein and a l.stemdisposed'betweentaid-valves and adapted to seat in said recesses tocompel one valve to be open when vthe otheris closed; and means forsupporting one of said valves against ltipping v when in open position.

orld chamber between said passages, said fluid operable member beingconnected to the valve" for operating the latter and including a meansadapted to fby-passiluid' to' eect thev applica.- 75

11. Ina suction operated motorhavlng a motor chamber. and piston meansmovable therein, an operating passage and a parking v`passage mentionedpassage between fsaid normally lopen valve and the motor chamber-forapplying a: parklmeans for alternately applying diierential prescludinga. passage on one side of the piston means', *a normally open valve forclosing said passage, a

inbpressure to the motorch'amber,v a normally vclosed valve for saidsecond-passage, means asadapte'dvto-be selectively connected'to a sourceaccording to the operation of said valve mechaalternately connecting the'opposite sidesofthe y motor'chamber to the atmosphere and to the 0P-erating passage to eiect voscillation of the piston in the chamber when`said operating conduit is connected to a source bi.'v operatingpressure, and fluid operated valve means responsive to pressure in theparking passage and actuated when-'the latter is connected toa source ofpressure to shut ofi' communication between one side of the chamberandthe automatic valve means and to open communication between' said oneside of the chamber and the parking passage.

13. In a fluid operated windscreen wiper moe .tor having a reciprocablepiston and automatic valve mechanism for applying fluid poweralternately to the opposite sides of said piston. for operating themotor, and having a control valve which is operable selectively toconnect a source of uid power either :by one passage to said valvemechanism for operating the motor or by a second passage to one sideonly of the piston for moving the piston to a parking position and therestopping the motor, the provision of a conduit leading from said valve'mechanism directly to said one side of the piston without passing nismwhen the motor is working, and valve means operable by the differencebetween the pressures in the conduit and the second passage for blockingsaid conduit when the control valveisbpratedto park the piston.

14, A iluid operated windscreen wiper motor having a reciprocable pistonand automatic valve mechanism for connecting a source of iluid poweralternately to opposite sides of the piston for operating the motor andat the same time venting the side of the piston not -for the time beingunder the influence of said source, and a control valve which when inone position connects said source through one passage to the automaticvalve mechanism for operating the motor and when lin another positiondisconnects said source from the automatic valve mechanism and connectsit through a second passage to one side onlyof the piston to move thelatter'to a parking position where the piston stops, characterised inthat,a conduit leads fromfthe automatic valve mechanism directly to thesaid one side of the piston without passing through the. control valve,a valve operable by the differential in the pressures in the secondpassage and the conduit and provided in the latter to prevent theventing of that side yof the piston to which said source is connectedwhen the control valve is moved to park the piston, thereby avoidingloss of power whilst the piston is being moved to the parking position.

ANTON RAPPL.

